基于结构光的深孔零件内表面单视角三维重建

Single-view 3D reconstruction of the inner surface of deep-hole parts based on structured light

针对深孔类零件内表面三维测量问题,提出了一种新型深孔类零件内表面三维重建算法。该方法使用远心镜头和多线结构光发生器获取深孔类零件内表面的结构光图像,结合深孔零件的形态特征,建立了基于柱坐标系的远心镜头三维投影模型,并利用图像的偏移量计算测量点的半径,并在此模型上获取测量图像的三维重建点云。实验结果表明,该方法在155 mm直径的深孔测量中均方根误差在0.03 mm以内,测量精度满足系统要求,为精确分析深孔零件内表面状态提供了数据基础。

Aiming at the problem of three-dimensional measurement of the inner surface of deep-hole parts,this paper proposes a new three-dimensional reconstruction algorithm for the inner surface of deep-hole parts.This method uses a telecentric lens and a multi-line structured light generator to obtain structured light images of the inner surface of deep-hole parts,combined with the morphological characteristics of deep-hole parts,establishes a three-dimensional projection model of a telecentric lens based on a cylindrical coordinate system,calculate the radius of the measurement point with the offset in image,and the 3 D reconstruction point cloud of the measurement image is obtained on this model.The experimental results show that the root-mean-square error of this method is within 0.03 mm in the measurement of a deep hole with a diameter of 155 mm,and the measurement accuracy meets the requirements of the system,which provides a data basis for accurately analyzing the state of the inner surface of deep-hole parts.